21cn.com

• Delegation
• Authoritative answer
• Related hostnames

Delegation

Authoritative answer

ANSWER for 21cn.com.
21cn.com.	600	A	58.211.81.104
	3600	MX	10 mta.21cn.com.
	300	NS	cdnns.21cn.com.
	36000	SOA	cdnns4.21cn.com. root.cdnns4.21cn.com. ( 2013061801 600 1200 36000 36000 )
	3600	TXT	"v=spf1 include:mail-spf.21cn.com -all"
ADDITIONAL for 21cn.com.
mta.21cn.com.	600	A	59.36.102.51
	600	A	59.36.102.50
cdnns.21cn.com.	3600	A	58.211.81.95
	3600	A	59.36.102.160
	3600	A	218.107.61.49

Related hostnames

House.21cn.com point to the same IP and also shares mail servers. Lottery.21cn.com, home.21cn.com, corp.21cn.com and mil.21cn.com point to the same IP. Cdn.21cn.com share both name servers and mail servers with this domain. 21cncorp.com, 21cn.net, 21drive.com, 21cn.cn, cdn.21cn.net and at least four other hosts share name servers with this domain. Hk.21cn.com, ymca.21cn.com, vip.21cn.com, cdnns5.21cn.com, cdnns4.21cn.com and at least three other hosts share mail servers with this domain. I.21cn.com, ucinc.21cn.com, ent.21cn.com, zhangs.21cn.com, mta-ent.21cn.com and at least 95 other hosts are hosts under this domain. 21cn.tv, 21cn.us, 21cn.in, 21cn.me, 21cn.co and at least twelve other hosts are similar domain names.

Also check www.21cn.com.

The name server cdnns.21cn.com

There are eleven domains that use the name server cdnns.21cn.com.

• All of those use only the name server cdnns.21cn.com (example: 32.105.202.in-addr.arpa, 60.140.61.in-addr.arpa and 45.105.202.in-addr.arpa ).
• Two of them use only the mail server mta.21cn.net.
• One of them point only to the IP number 121.14.129.150.
• One of them use only the mail server mta-ent.21cn.com.

The IP number 58.211.81.104

All of the six host names that point to the IP number 58.211.81.104 point only to that ip number.

The mail server mta.21cn.com

There are eleven domains that use the mail server mta.21cn.com.

• Five of those use only the mail server mta.21cn.com (example: cdnns2.21cn.com ).
• Five of them use the two mail servers mta and mta2.21cn.com together, hereafter referred to as "mail server group 1", (example: news.cdn.21cn.com ).
• Two of them point only to the IP number 58.211.81.104.
• Two of them use only the name server cdnns.21cn.com.

The name server cdnns.21cn.com only

There are eleven domains that only use the name server cdnns.21cn.com.

• Two of those use only the mail server mta.21cn.net.
• One of them use the mail server mta.21cn.com only (but not mta2.21cn.com ). Worth noting is that one of the domains that use the mail server mta.21cn.com only (but not mta2.21cn.com ) use only the name server cdnns.21cn.com.
• One of them use only the mail server mta.21cn.cn.
• One of them point only to the IP number 121.14.129.213.

The IP number 218.107.61.49

Two of the three host names that point to the IP number 218.107.61.49 point to the three IP numbers 58.211.81.95, 59.36.102.160 and 218.107.61.49 together, hereafter referred to as "IP group 1", (example: dns.21cn.com and cdnns.21cn.com ).

The IP number 58.211.81.95

Two of the three host names that point to the IP number 58.211.81.95 point to IP group 1.

The IP number 59.36.102.160

Two of the three host names that point to the IP number 59.36.102.160 point to IP group 1.

The two mail servers mta and mta2.21cn.com together

There are five domains that use mail server group 1.

• One of those use only the name server cdnns.21cn.com.
• One of them point only to the IP number 58.211.81.104.
• One of them point only to the IP number 121.14.129.213.
• One of them point to the six IP numbers 58.211.81.17, 58.211.81.18, 58.211.81.19, 58.211.81.27, 58.211.81.34 and 58.211.81.38 together.

The mail server mta.21cn.com only

One of the five domains that use the mail server mta.21cn.com only (but not mta2.21cn.com ) use only the name server cdnns.21cn.com. Worth noting is that one of the domains that only use the name server cdnns.21cn.com use the mail server mta.21cn.com only (but not mta2.21cn.com ).